Portable folding seat



FIG. 1 is a front perspective view of the portable folding seat shown in open position;

FIG. 2 is a front perspective view as shown in FIG. 1, but in closed position;

FIG. 3 is a back view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view, which is symmetrical to a left side view thereof;

FIG. 6 is a front side view thereof; and,

FIG. 7 is a top view thereof. 

The ornamental design for a portable folding seat, as shown and described. 